1791998227 has 2 divisors, whose sum is σ = 1791998228. Its totient is φ = 1791998226.

The previous prime is 1791998123. The next prime is 1791998249. The reversal of 1791998227 is 7228991971.

It is a strong prime.

It is an emirp because it is prime and its reverse (7228991971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1791998227 - 2¹¹ = 1791996179 is a prime.

It is a super-2 number, since 2×1791998227² = 6422515291142287058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1791998267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895999113 + 895999114.

It is an arithmetic number, because the mean of its divisors is an integer number (895999114).

Almost surely, 2^1791998227 is an apocalyptic number.

1791998227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791998227 is an equidigital number, since it uses as much as digits as its factorization.

1791998227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 55.

The square root of 1791998227 is about 42332.0000354342. Note that the first 4 decimals coincide. The cubic root of 1791998227 is about 1214.6351881644.

The spelling of 1791998227 in words is "one billion, seven hundred ninety-one million, nine hundred ninety-eight thousand, two hundred twenty-seven".